Fire indicator



0. D. PURINGTON.

FIRE INDICATOR. 'APPLICATIQN FILED APR.1. 192|.

Patented May 9,1922.

I VE NTOR.

' AT ORNEY.

UNITED STATE ORREN D. PURINGTON, OF PROVIDENCE, RHQDE ISLAND.

FIRE INDICATOR.

To all whom it may concern:

Be it known that I, O'BRIEN D. a citizen of the United States, residing at Providence, in the county of Providence and State of Rhode Island, have invented new and useful Improvements in Fire Indicators, of which the following is a specification.

This invention relates to certain new and useful improvements in fire indicators and the primary object thereof is to provide a device of this character which is devoid of all moving parts and in which the operation is certain and positive.

A further object of the invention is to pro vide a device of this type which can be easily and quickly refitted for continued use after operation thereof.

A still further object of the invention is to provide a device of this type which is of simple and economical construction and which is formed to be easily taken apart and to expose all of the parts for refitting when the parts are separated.

In the drawings:

Figure l is a perspective View of the invention;

Figure 2 is a side elevation, and

Figure 3 is a section on line 3-3 of Figure 2.

In proceeding in accordance with the present invention, a porcelain casing is employed formed of two similar or complementary parts 1, attached or secured together by screws 2. Each part is formed with a preferably curved flange or member 3 at each end thereof and extending inwardly from the correspondingly curved end walls l. The end walls and the curved flanges thereof abut and form a close fit or joint as depicted in Figures 1 and 3 of the drawings. The parts 1, have preferably convex contact receiving seats 5 on their confronting inner faces, which seats form upper and lower shoulders 6 and 7 respectively so as to firmly PunINcToN,

engage the correspondingly curved metalcontact plates 8. From Figure 3 of the drawings it will be observed that the plates 8, thus form a substantially V-shaped space therebetween.

The seats 5, are arranged below the topwalls 9 of the outer sides of the parts 1 so as to form fuse-receiving seats of L-form 10 which latter confront one another as shown. in Figure 3. The fuse 11 is made of a curved. strip of plate of soft metal having Specification of Letters Patent.

Patented May 9, 1922.

Application filed April 1, 1921. Serial No. 457,589.

formably engage the inner faces of the flanges 3 and to rest or engage in the seats 10. The fuse thus is of somwhat dome-shape and extends across or over or bridges the space existing between the metal contact plates 8. Suitable binding posts 12 are employed and are connected to contact terminals 12 which latter rest against or frictionally engage the respective contact plates 8, the posts 12 being placed in an electrical circuit having a fire signal, as is common in the art.

The contact plates 8 preferably are fitted so as to be frietionally held onto their seats and against the shoulders 6 and. 7, while the fuse is held in place by the curved flanges 8 holding same down onto or against the seats 10.

It will be now seen that the fuse offers orv exposes a large area to the surrounding air so that in event of fire or excessive heat it will quickly melt and will gravitate clownwardly and immediately fill more or less of the V-space between the contact plates 8 and will consequently act to electrically connect the plates 8, thus closing the circuit and sounding the alarm.

The fuse. it will be seen, acts as a cover for the device and due to its dome-like form is more thoroughly exposed to the surrounding air. Upon removal of the screws 12, the parts may be separated. the melted fuse rcmoved, and a new fuse refitted in place, and if found necessary, new contact plates 8 may likewise be substituted for the old. The device is thus devoid of all moving parts and assures a position and certain operation, as is evident.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:-

1. In fire indicator, a casing formed of two similar parts which have their inner faces abutting, and are formed with confronting convex seats located below the tops of the outer sides of the parts said tops form ing second L-shaped seats, the end walls of said parts having curved flanges which extend inwardly, screws for detachably con neeting the parts, curved contact plates on said convex seats and abutting the shoulders thereof, a binding post connected to each contact plate, and a curved fuse of domeform engaged between. the ends of the parts a low melting point and is of such size so as to abut the ends 4 of the parts 1; to conplate, and a curved fuse of dome-form en gaged between the ends of the parts and beneath the curved flanges thereof and engaged 15 at their loWe sides in the second seats.

in testimony whereo'l it have signed my name to this specification in the presence of two subscribing Witnesses.

ORR-EN D. PURINGTON.

Witnesses:

M. A. KINGsLnY, J. A. MILLER. 

